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Erdős's Robust Polynomial Interpolation Problem: the Optimal Exponential Scale

Yang, Jia-Qi
arXiv (OAI Expanded) · Papers
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classical-analysis-and-odesfunctional-analysis
We determine the optimal exponential scale in Erdős's robust polynomial interpolation problem and identify the leading exponential coefficient for Chebyshev--Lobatto grids. Given $C>0$ and $0\leρ<1$, put $H=C/(1-ρ)$. We prove that every configuration of $n\ge n_0$ nodes in $[-1,1]$ admits sign data
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